Let's roll up our sleeves and solve this. We have 788 and we're going to multiply it by 12, essentially adding 788 to itself 12 times.
Step 1: 0 + 788 = 788
Step 2: 788 + 788 = 1576
Step 3: 1576 + 788 = 2364
Step 4: 2364 + 788 = 3152
Step 5: 3152 + 788 = 3940
Step 6: 3940 + 788 = 4728
Step 7: 4728 + 788 = 5516
Step 8: 5516 + 788 = 6304
Step 9: 6304 + 788 = 7092
Step 10: 7092 + 788 = 7880
Step 11: 7880 + 788 = 8668
Step 12: 8668 + 788 = 9456

So, 788*12 = 9456